Question about Ford F-150

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I have a 1993 Ford f-150 with a 5.0 liter motor. I have DTC codes 172 &412. I know the definitions of these codes. I need a repair plan to remedy the problems. Please help. Lou

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  • loustoy235 Dec 31, 2010

    Thank you. This was very helpful and a very good and thorough solution. I apologize for not marking it accepted sooner. Thank You.....again... Good Job!



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172 is the lanbda sensor for the exhaust emmisions that is a simple unbolt and remove the wire plug job, easy to do. the second code 412 maf sensoror air mass sensor, this could be tricky because the first code 172 could cause this second code by the egine trying to compensate, also though alternatively the second code can cause the first by again compensating or forcing too much air to keep the idle high.

My betting is that the air sensor or maf sensor is at fault as this would cause the car to want more air and more fuel thus pushing emmisions high causing the emmisions code or lambda.

Also though it could be neither, if you have a split air pipe or a poor seal on any air intake pipe or from the air box say there was no air filter then that would again cause too much air + fuel. Have a good look at all your air pipes and vacuum pipes any of these with even pin holes in may cause the issue.

Lastly they are both cheap parts for a ford so after you check the pipes if there is no rips tears etc then change them both, the car wil run better and you will save fuel as well.

Hope this helps


Posted on Dec 28, 2010


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